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z in (-oo:+oo)
72/45 = 4.5*z // - 4.5*z
72/45-(4.5*z) = 0
72/45-4.5*z = 0
8/5-4.5*z = 0 // - 8/5
-4.5*z = -8/5 // : -4.5
z = -8/5/(-4.5)
z = 0.35555556
z = 0.35555556
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